Omni-directional antenna



FIG. 1 is a front elevational view of an omni-directional antenna showing my new design, the rear elevational view being the same as FIG. 1.

FIG. 2 is a right side elevational view thereof, with the left side elevational view being the same as FIG. 2.

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a top plan view thereof. 

The ornamental design for an omni-directional antenna, as shown and described. 